Bulk limit of superconducting condensation energy in 2D Hubbard model

被引：36

作者：

Yamaji, K ^{[1
]}

Yanagisawa, T ^{[1
]}

Koike, S ^{[1
]}

机构：

[1] Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICA B | 2000年 / 284卷

关键词：

Hubbard model; superconducting condensation energy; variational Monte Carlo method;

D O I：

10.1016/S0921-4526(99)01983-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied the possibility of superconductivity (SC) in the titled model by computing the SC condensation energy per site as the energy gain in the d-pairing SC state using the variational Monte Carlo method. Its bulk limit was obtained by finite-size scaling with approximately fixed electron density rho. This value survived finite for rho greater than or equal to 0.84 when next n.n. transfer energy t' satisfied - 0.25t less than or equal to t' less than or equal to - 0.10t with on-site Coulomb energy U = 8t; here t is the n.n. transfer energy. The obtained values are of the order of the experimental one for YBCO. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：415 / 416

页数：2

共 6 条

[1] Effective single-band models for the high-T-c cuprates .1. Coulomb interactions [J].